MAL-2026-12585 Malicious code in checkout-pay-widget-logic (npm)
Malicious package
Published
MAL-2026-12585 is a malicious package: checkout-pay-widget-logic (npm). Every version was published to cause harm.
Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.
Reference: https://insights.sbomify.com/MAL-2026-12585/ (Markdown: https://insights.sbomify.com/MAL-2026-12585/index.md)
- Package
- checkout-pay-widget-logic
- Registry
- npm
What is MAL-2026-12585?
MAL-2026-12585 is a malicious package in checkout-pay-widget-logic, published on 5 Aug 2026.
Official description
On require('checkout-pay-widget-logic'), index.js loads./vendor.js which downloads a platform-specific binary over HTTPS from hardcoded Cloudflare Workers hosts (oob-worker.cf*.workers.dev), with a DNS TXT fallback under *.dl.wel1.ru that reassembles base64 chunks from TXT records. C2 hostnames are assembled at runtime by joining split string fragments to evade static detection. The fetched binary is written to /tmp or %TEMP% under disguised names (.cache<hex> on Unix, dotnet_diag_<hex>.exe on Windows, mimicking a Microsoft diagnostic tool), chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe with stdio ignored. A lock file named.analytics_state and 'telemetry'-labeled functions provide a cover story; the package's stated purpose is a 'log formatter'. Environment-variable opt-outs exist but the dropper runs by default.
What should I do about MAL-2026-12585?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.